linux-kernel - Re: [RFC PATCH 3/7] i2c: allow DT nodes without 'compatible'

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Date:   Fri, 21 Feb 2020 10:48:27 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     Linux I2C <linux-i2c@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        linux-i3c@...ts.infradead.org,
        Kieran Bingham <kieran@...uared.org.uk>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Luca Ceresoli <luca@...aceresoli.net>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [RFC PATCH 3/7] i2c: allow DT nodes without 'compatible'

On Fri, Feb 21, 2020 at 10:45 AM Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> On Thu, Feb 20, 2020 at 6:26 PM Wolfram Sang
> <wsa+renesas@...g-engineering.com> wrote:
> > Sometimes, we have unknown devices in a system and still want to block
> > their address. For that, we allow DT nodes with only a 'reg' property.
> > These devices will be bound to the "dummy" driver but with the name
> > "reserved". That way, we can distinguish them and even hand them over to
> > the "dummy" driver later when they are really requested using
> > i2c_new_ancillary_device().
> >
> > Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
>
> Thanks for your patch!
>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

FTR, depending on the extra dummy removed.

> but one question below.
>
> > --- a/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
> > +++ b/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
> > @@ -50,7 +50,6 @@ Examples:
> >                 reg-io-width = <1>;     /* 8 bit read/write */
> >
> >                 dummy@60 {
> > -                       compatible = "dummy";
> >                         reg = <0x60>;
> >                 };
> >         };
>
> There's a second instance to remove 18 lines below.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds